look up any word, like donkey punch:
 
1.
you just trashy,ain't nothing but a bum,creep,loser,coward,waste,etc
or someone who can't do nothin,but eating,playing and sleeping
A:godamn it,you always mess everything up
B:sorry man,but i aint mean to....
A:shut the fuck up,don't explain,you aint shit!
by Emagician August 03, 2005
 
2.
you really suck at a sport or game or anything you do
Daquan: you let him beat you 25-0

michael: shut up

Daquan: no you shut up ... YOU AINT SHIT !
by SwaggedUp November 19, 2009